/* 1. CSS Reset & Base */
:root {
    /* Colors - Light Mode (Default) */
    --color-bg: #ffffff;
    --color-text: #2d3748; /* gray-800 */
    --color-text-soft: #4a5568; /* gray-600 */
    --color-text-muted: #6b7280; /* gray-500 */
    --color-text-header: #111827; /* gray-900 */
    --color-bg-offset: #f9fafb; /* gray-50 */
    --color-border: rgba(0, 0, 0, 0.05);
    --color-card-bg: rgba(255, 255, 255, 0.7);
    --color-footer-bg: #f9fafb; /* gray-50 */
    --color-footer-border: #e5e7eb; /* gray-200 */
    --color-footer-text: #6b7280; /* gray-500 */
    --color-link: #3b82f6; /* blue-500 */
    --color-link-hover: #2563eb; /* blue-600 */
    --color-icon-blue: #3b82f6; /* blue-500 */
    --color-icon-green: #22c55e; /* green-500 */
    --color-icon-purple: #a855f7; /* purple-500 */
    --color-icon-blue-bg: rgba(59, 130, 246, 0.1);
    --color-icon-green-bg: rgba(34, 197, 94, 0.1);
    --color-icon-purple-bg: rgba(168, 85, 247, 0.1);

    /* Colors - Buttons */
    --color-btn-blue-bg: #2563eb; /* blue-600 */
    --color-btn-blue-hover: #1d4ed8; /* blue-700 */
    --color-btn-gray-bg: #374151; /* gray-700 */
    --color-btn-gray-hover: #4b5563; /* gray-600 */
    --color-btn-text: #ffffff;
}

html.dark {
    /* Colors - Dark Mode */
    --color-bg: #1a202c; /* custom gray-900 */
    --color-text: #e2e8f0; /* gray-200 */
    --color-text-soft: #d1d5db; /* gray-300 */
    --color-text-muted: #9ca3af; /* gray-400 */
    --color-text-header: #ffffff;
    --color-bg-offset: rgba(31, 41, 55, 0.3); /* gray-800/30 */
    --color-border: rgba(255, 255, 255, 0.1);
    --color-card-bg: rgba(45, 55, 72, 0.4);
    --color-footer-bg: rgba(31, 41, 55, 0.3); /* gray-800/30 */
    --color-footer-border: rgba(55, 65, 81, 0.5); /* gray-700/50 */
    --color-footer-text: #9ca3af; /* gray-400 */
    --color-link: #60a5fa; /* blue-400 */
    --color-link-hover: #93c5fd; /* blue-300 */
    --color-icon-blue: #60a5fa; /* blue-400 */
    --color-icon-green: #4ade80; /* green-400 */
    --color-icon-purple: #c084fc; /* purple-400 */
    --color-icon-blue-bg: rgba(96, 165, 250, 0.1);
    --color-icon-green-bg: rgba(74, 222, 128, 0.1);
    --color-icon-purple-bg: rgba(192, 132, 252, 0.1);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.6;
}

main {
    padding-top: 5rem; /* 80px */
}

section {
    padding: 6rem 1.5rem; /* 96px */
}

section.bg-offset {
    background-color: var(--color-bg-offset);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 2. Layout */
.container {
    max-width: 64rem; /* 1024px */
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem; /* 24px */
    padding-right: 1.5rem; /* 24px */
}

.container-narrow {
    max-width: 52rem; /* 832px */
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.container-text {
    max-width: 48rem; /* 768px */
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.grid-cols-1-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: center;
}

.grid-cols-1-3 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

/* 3. Typography */
h1 {
    font-size: 2.25rem; /* 36px */
    line-height: 1.2;
    font-weight: 800;
    color: var(--color-text-header);
    margin-top: 1rem;
}

h2 {
    font-size: 1.875rem; /* 30px */
    line-height: 1.3;
    font-weight: 700;
    color: var(--color-text-header);
}

h3 {
    font-size: 1.5rem; /* 24px */
    font-weight: 700;
    color: var(--color-text-header);
    margin-top: 1.5rem;
}

p, a {
    font-size: 1rem; /* 16px */
    line-height: 1.7;
}

p.lead {
    font-size: 1.25rem; /* 20px */
    color: var(--color-text-soft);
}

p.text-lg {
     font-size: 1.125rem; /* 18px */
     color: var(--color-text-soft);
}

p + p {
    margin-top: 1rem;
}

.section-center {
    text-align: center;
}

.section-center h2 {
    margin-bottom: 4rem;
}

.text-gradient {
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    background-image: linear-gradient(to right, #42d392, #64b5f6);
}

.text-kicker {
    text-transform: uppercase;
    font-size: 0.875rem; /* 14px */
    font-weight: 600;
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
}

.text-kicker-blue {
    font-weight: 600;
    color: var(--color-link);
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: var(--color-link-hover);
}

a.link-underline {
    text-decoration: underline;
    font-weight: 500;
}

/* 4. Header & Navigation */
.site-header {
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 50;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    /* Glass Card effect */
    background: var(--color-card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.site-header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 5rem; /* 80px */
}

.logo {
    font-size: 1.5rem; /* 24px */
    font-weight: 700;
    color: var(--color-text-header);
}

.nav-links {
    display: none; /* Hidden on mobile */
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--color-text-soft);
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--color-text-header);
}

/* Navigation controls (theme toggle + mobile menu) - always visible */
.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-nav-toggle {
    display: block; /* Always show on mobile */
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-soft);
}

.mobile-nav-toggle svg {
    width: 1.5rem;
    height: 1.5rem;
}

#mobile-menu {
    display: none; /* Hidden by default */
    padding-bottom: 1rem;
    border-top: 1px solid var(--color-border);
}

#mobile-menu.active {
    display: block;
}

#mobile-menu a {
    display: block;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    color: var(--color-text-soft);
}

#mobile-menu a:hover {
    color: var(--color-text-header);
}

/* 5. Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-soft);
    transition: color 0.3s;
    width: 1.5rem;
    height: 1.5rem;
}
.theme-toggle:hover {
    color: var(--color-text-header);
}
.theme-toggle svg {
    width: 100%;
    height: 100%;
}
.theme-toggle-light-icon {
    display: none;
}
html.dark .theme-toggle-light-icon {
    display: block;
}
html.dark .theme-toggle-dark-icon {
    display: none;
}


/* 6. Hero Section */
#home {
    min-height: 80vh;
    display: flex;
    align-items: center;
    padding-top: 6rem;
    padding-bottom: 6rem;
}

.hero-buttons {
    margin-top: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.btn {
    display: inline-block;
    text-decoration: none;
    font-weight: 600;
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    transition: all 0.3s;
    text-align: center;
}

.btn-primary {
    background-color: var(--color-btn-blue-bg);
    color: var(--color-btn-text);
}
.btn-primary:hover {
    background-color: var(--color-btn-blue-hover);
    color: var(--color-btn-text);
}

.btn-secondary {
    background-color: var(--color-btn-gray-bg);
    color: var(--color-btn-text);
}
.btn-secondary:hover {
    background-color: var(--color-btn-gray-hover);
    color: var(--color-btn-text);
}

/* 7. Cards (Experience) */
.card {
    background: var(--color-card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem; /* 12px */
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-0.5rem);
}

.card-icon {
    width: 4rem;
    height: 4rem;
    border-radius: 9999px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-icon svg {
    width: 2rem;
    height: 2rem;
}

.card-icon-blue {
    background-color: var(--color-icon-blue-bg);
    border: 1px solid var(--color-icon-blue);
    color: var(--color-icon-blue);
}
.card-icon-green {
    background-color: var(--color-icon-green-bg);
    border: 1px solid var(--color-icon-green);
    color: var(--color-icon-green);
}
.card-icon-purple {
    background-color: var(--color-icon-purple-bg);
    border: 1px solid var(--color-icon-purple);
    color: var(--color-icon-purple);
}

.card p {
    margin-top: 0.5rem;
    color: var(--color-text-soft);
}

#about img {
    border-radius: 9999px; /* This makes it a circle */
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    width: 300px; /* Fixed size for a profile pic */
    height: 300px; /* Fixed size for a profile pic */
    max-width: 100%;
    margin: 0 auto;
    object-fit: cover; /* Ensures the image fills the circle */
}

/* 8. Contact & Footer */
.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2.5rem;
}

.social-links a {
    color: var(--color-text-muted);
    transition: color 0.3s;
}
html.dark .social-links a {
    color: var(--color-footer-text);
}

.social-links a:hover {
    color: var(--color-text-header);
}
html.dark .social-links a:hover {
    color: var(--color-bg);
}

.social-links svg {
    width: 2.5rem;
    height: 2.5rem;
}

.site-footer {
    background-color: var(--color-footer-bg);
    border-top: 1px solid var(--color-footer-border);
    padding: 2rem 1.5rem;
    text-align: center;
    color: var(--color-footer-text);
    font-size: 0.875rem;
}

/* 9. Responsive Breakpoints */

/* Small devices (tablets) */
@media (min-width: 640px) {
    .hero-buttons {
        flex-direction: row;
        flex-wrap: wrap;
    }
}

/* Medium devices (tablets, small desktops) */
@media (min-width: 768px) {
    h1 {
        font-size: 3rem; /* 48px */
    }
    .nav-links {
        display: flex;
    }
    .mobile-nav-toggle {
        display: none; /* Hide hamburger menu on desktop */
    }
    #mobile-menu {
        display: none !important; /* Always hide on desktop */
    }
    .grid-cols-1-3 {
        grid-template-columns: repeat(3, 1fr);
    }
    p.lead {
        font-size: 1.5rem; /* 24px */
    }
}

/* Large devices (desktops) */
@media (min-width: 1024px) {
    h1 {
        font-size: 3.75rem; /* 60px */
    }
    h2 {
        font-size: 2.25rem; /* 36px */
    }
    .grid-cols-1-2 {
        grid-template-columns: repeat(2, 1fr);
    }
}